SI598 Datasheet, PDF (15/28 Pages) Silicon Laboratories – Programmable with 28 parts per trillion frequency resolution

Si598/Si599
4. Serial Port Registers
Note: Registers not documented are reserved. Values within reserved registers and reserved bits must not be changed.
Register Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
7 High Speed/
N1 Dividers
HS_DIV[2:0]
N1[6:2]
8
Reference
Frequency
N1[1:0]
RFREQ[37:32]
9
Reference
Frequency
RFREQ[31:24]
10
Reference
Frequency
RFREQ[23:16]
11
Reference
Frequency
RFREQ[15:8]
12
Reference
Frequency
RFREQ[7:0]
135 NewFreq/ Reserved NewFreq Freeze M Freeze
Freeze/
VCADC
Memory
Control
Reserved
137 Freeze DCO
Reserved
Freeze
DCO
Reserved
Bit 0
RECALL
Rev. 1.0
15